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/etc/inittab
Init needs a configuration file that specifies what actions need to be taken. This configuration file is /etc/inittab
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sysinit
init's first action is to mount all file systems. This is defined in the following line from /etc/inittab.
si::sysinit:/sbin/openrc sysinit
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bootwait
init's second action is to execute all scripts that had symbolic links in /etc/runlevels/boot/. This is defined in the following line from /etc/inittab.
rc::bootwait:/sbin/openrc boot
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initdefault
init checks its configuration file to see what runlevel it should run. To decide this, it reads the following line from /etc/inittab.
id:3:initdefault:
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runlevel
In this casethe runlevel id is 3. Using this information, init checks what it must run to start runlevel 3.
l3:3:wait:/sbin/openrc default. The line that defines level 3, again, uses the openrc script to start the services (now with argument default)
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consoles
init decides what virtual consoles it should activate and what commands need to be run at each console.
c1:12345:respawn:/sbin/agetty 38400 tty1 linux c2:12345:respawn:/sbin/agetty 38400 tty2 linux c3:12345:respawn:/sbin/agetty 38400 tty3 linux c4:12345:respawn:/sbin/agetty 38400 tty4 linux c5:12345:respawn:/sbin/agetty 38400 tty5 linux c6:12345:respawn:/sbin/agetty 38400 tty6 linux |
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/etc/rc.conf
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sysinit
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shutdown
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reboot
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boot
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default
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nonetwork
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single
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Working with initscripts
The scripts that the openrc process starts are called init scripts. Each script in /etc/init.d/ can be executed with the arguments start, stop, restart, zap, status, ineed, iuse, iwant, needsme, usesme, or wantsme.
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Start a service
/etc/init.d/postfix start
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Stop a service, but not the services that depend on it
/etc/init.d/postfix --nodeps stop
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See what status a service has
/etc/init.d/postfix status
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Ask what dependencies the service has
/etc/init.d/postfix ineed
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Ask what services require the service
/etc/init.d/postfix needsme
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/etc/conf.d
Every init script that can be configured has a file in /etc/conf.d/. For instance, the apache2 initscript (called /etc/init.d/apache2) has a configuration file called /etc/conf.d/apache2, which can contain the options to give to the Apache 2 server when it is started. Such a configuration file contains only variables.
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Replace runlevel
Add a new entry in the bootloader configuration for the desired runlevel. In that entry, add
softlevel=desired as a boot parameter.
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Change to nonetwork runlevel
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rc nonetwork
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Change to default runlevel
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rc default
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Change to shutdown runlevel
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rc shutdown
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Change to reboot runlevel
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rc reboot
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Show status info about runlevels
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rc-status [runlevel]
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Locate and run an OpenRC service
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rc-service service cmd [...]
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Adding services
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rc-update add postfix default
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Removing services
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rc-update del postfix default
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Showing services
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rc-update show
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